InterceptableValidator.php

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<?php
namespace Magento\Framework\ObjectManager;

class InterceptableValidator
{
    public function validate($className)
    {
        return !$this->isInterceptor($className) && $this->isInterceptable($className);
    }

    private function isInterceptor($instanceName)
    {
        return $this->endsWith($instanceName, '\Interceptor');
    }

    private function isInterceptable($instanceName)
    {
        return !is_subclass_of(
            $instanceName,
            '\\' . \Magento\Framework\ObjectManager\Code\Generator\Proxy::NON_INTERCEPTABLE_INTERFACE
        );
    }

    private function endsWith($haystack, $needle)
    {
        // Search forward starting from end minus needle length characters
        $temp = strlen($haystack) - strlen($needle);
        return $needle === '' || ($temp >= 0 && strpos($haystack, $needle, $temp) !== false);
    }
}